... Log Wrap ... Log Wrap ... Log Wrap ...
ERROR: (device loop0): txBegin: read-only filesystem
jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_dirty_inode called on read-only volume
Is remount racy?
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000c7: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000638-0x000000000000063f]
CPU: 1 UID: 0 PID: 6027 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xdd/0x490 fs/jfs/jfs_txnmgr.c:507
Code: 48 c1 ea 03 80 3c 02 00 0f 85 a5 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 8d bd 38 06 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 75 03 00 00 48 8b ad 38 06 00 00 48 b8 00 00 00
RSP: 0018:ffffc900032a7660 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffffc900026b9000 RCX: 0000000000000000
RDX: 00000000000000c7 RSI: ffffffff8de85622 RDI: 0000000000000638
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8ee27340 R14: 0000000000000000 R15: ffff88805a911fa8
FS:  000055555bb04500(0000) GS:ffff888124439000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb614596000 CR3: 000000003567c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 jfs_create+0x92e/0xb10 fs/jfs/namei.c:160
 lookup_open.isra.0+0xc47/0x11b0 fs/namei.c:4489
 open_last_lookups fs/namei.c:4589 [inline]
 path_openat+0x2291/0x31a0 fs/namei.c:4833
 do_file_open+0x20e/0x430 fs/namei.c:4865
 do_sys_openat2+0x10d/0x1e0 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59f939c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffcea53158 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f59f9615fa0 RCX: 00007f59f939c819
RDX: 000000000000275a RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f59f9432c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59f9615fac R14: 00007f59f9615fa0 R15: 00007f59f9615fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline]
RIP: 0010:txEnd+0xdd/0x490 fs/jfs/jfs_txnmgr.c:507
Code: 48 c1 ea 03 80 3c 02 00 0f 85 a5 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 8d bd 38 06 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 75 03 00 00 48 8b ad 38 06 00 00 48 b8 00 00 00
RSP: 0018:ffffc900032a7660 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: ffffc900026b9000 RCX: 0000000000000000
RDX: 00000000000000c7 RSI: ffffffff8de85622 RDI: 0000000000000638
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8ee27340 R14: 0000000000000000 R15: ffff88805a911fa8
FS:  000055555bb04500(0000) GS:ffff888124439000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb614596000 CR3: 000000003567c000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 a5 03 00 00    	jne    0x3b3
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	48 8b 6b 20          	mov    0x20(%rbx),%rbp
  1c:	48 8d bd 38 06 00 00 	lea    0x638(%rbp),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 75 03 00 00    	jne    0x3a9
  34:	48 8b ad 38 06 00 00 	mov    0x638(%rbp),%rbp
  3b:	48                   	rex.W
  3c:	b8                   	.byte 0xb8
  3d:	00 00                	add    %al,(%rax)